VCP disease is a unique genetic disease. Originally termed Inclusion body myopathy with early-onset Paget disease and frontotemporal dementia (IBMPFD) since it can lead to any one of these distinct phenotypes (even within the same family). Published in 2018, this study details the disease progression in 231 individuals.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5739971/